Apparatus for applying serving material to a core



Nov. 22, 1949 v. A. RAYBURN APPARATUS FOR APPLYING SERVING MATERIAL TO CORES 2 Sheets-Sheet l Filed Oct. 29, 1946 /NvE/v TOR l/. A. RA YBURN A T TORNEV Nov. 22, 1949 v A RAYBURN 2,488,934

APPARATUS FOR APPLYING SERVING MATERIAL TO CORES Filed Oct. 29, 1946 2 Sheets-Sheet 2 A TTOR/VEY Patented Nov. 22, 1949 APPARATUS Fon APPLYING ssavmc MATERIAL ro A cons Vincent A. Rayburn, Baltimore, Md., assig'nor to Western Electric Company, Incorporated, New York, N. Y., a corporation of New York Application October 29, 1946, Serial No. 706,443

14 Claims. (Cl. 57-3) 'I'his invention relates to material sewing apparatus of the type in which a cop or bobbin of serving yarn is rotatably mounted concentrically of the strand to be served and thecop or bobbin is adapted in its rotation to have the serving yarn drawn therefrom and applied spirally to the strand, and more particularly to such an apparatus for applying a serving of fiberglass over a strand or core.

In the application of fiberglass or like yarn as insulation servings on conductors or as lashings to bind together several strands of conducting wire, there in an expulsion of a considerable quantity of lint or very short fibers broken away from the yarn and thrqwn'into the air by the rapidly rotating server head. These lints of berglass or like materials become imbedded in the skin and mucous membranes of the respiratory tract of the operator of the serving machine and produce considerable irritation and pain if not actual permanent injury.

The primary object of this invention is to provide a serving head having an air impelling means and an air lter for preventing the atmosphere adjacent the serving head from being contaminated with particles broken away from the serving yarn material.

Another object is to provide a serving guide for applying the serving material to the strand `or core without abrupt or sharp bends to thus prevent or minimize the breaking of particles from the serving material.

In accordance with this and other objects the serving head is provided with a rotating cylindrical exhaust hood or bobbin case air impeller having slots and inwardly extending radial fins which induce a ow of air inwardly over the serving head, the serving guide and the bobbin of serving material. This exhaust hood or bobbin case air impeller is enclosed in an involute hous.

ing split transversely and provided with a hinge and latch so that it can be opened to afford access in threading the serving head with a material to be served on a strand or core. Fitted inside this housing with suitable clearances between the inside housing wall and the cylindrical bobbin case is a illter saturated with a viscous oil andplaced in the path of the induced airstream so as to catch all particles broken off from the serving yarn material. The serving head is also provided with a serving guide having a pair of guide pins and a slotted cylindrical member so shaped that roughening or abrupt bending of the serving material is avoided.

A clear understanding of the invention will be had from the following description of one embodiment thereof illustrated in the accompanying drawing. wherein,

Fig. 1 is a longitudinal sectional view of a serving head and serving guide equipped with an air impeller and air lter housing embodying the present invention;

Fig. 2 is a cross-sectional view taken on line 2-2 of Fig. 1;

Fig. 3 is a fragmentary view of a portion of the housing showing a latch for securing the two hinged parts of the serving head housing together, looking in the direction indicated by the arrows in Fig. 2, and

Fig. 4 is a sectional view of the serving guide taken on line 4--4 of Fig. 1.

-Referring now to the drawings in which like reference numerals indicate the same parts throughout the several views, a hollow spindle I0 is rotatably mounted on two bearings and in a spacer sleeve I2 which separates these bearings. fIhe bearings and sleeve I2 are held in proper place by a tubular support |3 which is secured to a frame I4 of the machine.

The spindle III is rotated by a suitable power means, such as a motor (not shown) through a gear I5 which is keyed or splined to the spindle and locked thereon by a threaded nut I6. Adjacent this locking nut is a strand or core guide bushing I1 threaded into a stationary bracket I8 on the machine and having a reduced portion I9 projecting into a recess 20 inthe left end oi the spindle.

Secured to the spindle Ill at a point adjacent the right hand bearing is a hub 2| which extends partially into a circular opening 22 in the tubular support I3. The hub 2| has a circular ange 23 which forms the left hand wall of the serving head, designated generally by the reference numeral 24. A servinghead shell 21 having an outwardly ared rim 28 is 'fastened to the flange 23 by welding or any other suitable means. This shell 2l is also provided with suitable openings in whichk are xed polished eyelets 29 for threading a serving material, such as fiberglass 30, which in the form of a cop or bobbin 30 is mounted on a tubular fiber member 3|. 'Ihe tubular member 3| is secured in position on a cop sleeve 32 by pressing the member 3| over a plurality of ns 33 integral with the sleeve 32.

The cop sleeve 32 is mounted on 'a reduced portion 34 of the spindle I0 so that it may be rotated freely thereon. An integral upturned ange 35 at the left end of the sleeve 32 is adapted to engage a disk 36 loosely mounted on the reduced susana;

portion 34 oi the spindle l0. The disk 3l is resiliently engaged by a cone shaped coil spring 31 which encircles the reduced portion of the spindie and nests in a. circular recess 33 provided in Y the right hand side of the hub 2|. The cop sleeve 32 with its iiange Il along with the disk 33 are pushed toward the left to compress the spring 31 by an adjustable nut 40 which is threaded onto the right hand end of the reduced portion 34 of the spindle I a desired amount. This adjusting nut 4l is held in the desired position by a lock nut 4|.

The right hand end of the reduced portion of the spindle il is so constructed as to terminate'in a split collet chuck 42 which receives and holds a serving guide 43 for applying the serving material 30 to a strand, core. or conductor 44 which is advanced through the rotatable hollow spindle I0 and hollow guide 43 at a uniform speed in the direction indicated by an arrow in Fig. 1.

I'he serving guide 43 (Figs. 1 and 4) is provided with two spaced guide pins '45, which extend parallel with a slot 43 in the guide. The serving guide as shown in Fig. 4. has a thickened and rounded nose edge 41 over which the serving material 30 passes without sharp bends in being applied to the advancing conductor 44. With this particular arrangement oi' parts in the serving guide it has been proven by numerous tests that less lint or ilbers are liberated from the fiberglass serving material, when being served on the core, than is evident when using the ordinary server nose, due to the fact that the serving material contacts only smooth gradually curved surfaces which reduces friction and bending of the material to a minimum.

To remove from the atmosphere any lint or short ilbers that may be broken away from the serving material 3l) of fiberglass as it is served over the conductor 44, the serving head shell 21 is provided with a plurality of inwardly extending flns 50 (Fig. 2) adjacent a plurality of spaced openings or slots 5I, which are produced by partially piercing or punching out portions of the metal shell 21. This construction makes of the serving head shell 21 an air impeller,

which due to the high rotative speed of the' serving head induces a ilow of fast moving air inwardly over and around the serving guide 43 and a cop 30 of serving material 30 to suck any lint from the surrounding atmosphere through the openings 5I and directing such lint to and impinging it upon semi-cylindrical air iiltering elements 52.

The air iiltering elements 52 which form a circle are supported and spaced in concentric arrangement from the air impeller shell 21 by a housing 53 which is secured to the tubular support I3 oi' the machine by a flanged collar 54. This housing 53 comprises spaced side plates 55 and 53, the plate 55 being suitably secured to the collar 54 and the plate 56 being spaced therei'rom by means of a semi-cylindrical member 51 and two hanged members 58 and 59, the latter supporting iiltering element 52 in conjunction with spaced ilanges secured to the two flange members 53 and 59 as shown in Fig. 1. The plates and 5l, the anged members 53 and 53 and the semi-cylindrical members 51 may be secured in air-tight relation by means of welding, soldering. etc. The plate 55 is provided with an inlet opening through which loose ilber and lint are A drawn from the serving guide 43 to and through the openings 5l in the air impeller 21. The edge oi' the plate 55 surrounding the opening is flared the filtering elements, renewing a cop of serving material. and threading the serving 'material 30 through the serving head to the serving guide 43. The spacing oi the flange members 58 and 50 is such that the filtering elements 52 fit snugly therebetween and can be readily removed when renewal is necessary. The filters 52 comprise bats oi low resistance viscous iilm air iilter such as bronze wool backed by a metal screen and the whole is saturated by a nonoxidizing oil or light grease. However, it is to be understood that any type of filter might be used that would arrest the travel of lint or ber. The iiltered air passing through the illtering elements 52 passes out of the serving head housing through an outlet 64 into a suitable duct system.

In the operation oi the serving head, the serving material 30 is threaded from the cop 30' up through an opening 5| in the air impeller shell 21, through the polished guide eyelet 29 down between the pair of guide pins 45 (Fig. 4) around the rounded thickened nose portion 41 of the serving guide 43 and then onto the core or conductor 44 where it is tied. The conductor 44 is then advanced through the hollow spindle I0 in the direction indicated by the arrow and driving power is supplied to the gear I5 to rotate the spindle i0, the hub 2i, the air impeller shell 21,`

and the serving guide 43 at high speed. The serving material 30 is thus pulled from the cop 30' and served in a spiral on the advancing conduetor or core 44 by the serving guide 43 as shown in Fig. l.

The tension on the serving material 30 is controlled by turning the threaded adjusting nut 40 on the reduced portion 34 of the spin'dle lll to determine the pressure exerted by the spring 31 on the disk 36 which frictionally engages the flange 35 of cop sleeve 32 which carries the rotating bobbin 30' of serving material 30. By screwing the adjusting nut 40 toward the spring 31 the pressure between the flange 35 on the cop sleeve V32 and the disk is increased to thus increase the tension on -the serving material 2B.

The rapid rotation of the serving head shell 21 carrying the radially inwardly extending blades 50 creates a suction of suilicient force to effect the atmosphere around the nose of the serving head and any lint, fiber, etc., which might become loose, would be drawn by the force of the air stream into the housing and through the holes 5| in the serving head shell 21 and be implnged onto the air illter. Thus the fibers of glass or any material loosened from the serving material or from the core would be entrapped on the illtering elements 52.

Although the invention has been described in connection with a speciiic form thereof, it will be understood that it has further applications and it is not intended to be limited in scope by the embodiment shown herein for illustration.

What is claimed is:

1. In an apparatus for applying a serving material to a core, a serving head, a serving guide for directing the material to the core, means for inducing a flow of air inwardly and around the serving head and guide at the location where the serving material is applied to the core to carry directly into the serving head any lint or nbers that might become separated from the serving material, and a filter for separating said lint or fibers from the flow of air.

2. In an apparatus for applying berglass strands to a conductor, a serving head, a rotatable shell surrounding the serving head and provided with a plurality of openings around the periphery thereof, radial air impeller ns adjacent to said openings and secured to the rotary shell to rotate therewith and for causing air to flow over the serving head and into said openings, and a filtering element surrounding the shell for removing particles of glass ber from the air passing therethrough.

3. In an apparatus for applying flberglass strands to a conductor, a serving head, a serving guide for directing the material to' the conductor, a housing surrounding the head, air suction means positioned in the housing for causing air to flow past and around the serving head at the union of the strands with the conductor and into the housing so that any loose berglass bers thrown ofi of the strands will be entrained in the air stream and carried directly into the housing, and a filter for removing the particles of glass fibers from the air passing therethrough. y

4. In a serving machine of the class wherein a cop of serving material is rotatably mounted concentrically of a core to be served and the cop is adapted in its rotation to have the serving material drawn therefrom and applied spirally to the core, the combination with said serving machine of means for inducing a stream of air along the core and inwardly around the cop and the serving material at the union of the serving material and the core to carry directly into the serving head any lint or fibers that might become separated from the serving material, and means for removing such lint or fibers from the air stream.

5. In an apparatus for applying a serving material to a core, a hollow rotating spindle throughv which the core advances, a serving guide attached to the spindle for applying the material to the core, and an air impelling means attached to the rotating spindle for inducing a flow of air over the serving material'and around the serving guide where the union of the serving material with the core is made to carry .directly into the serving head any lint that becomes separated from the serving material.

6. In an apparatus for applying a serving material to a core, a rotatable serving guide for applying the serving material to the core, an exhaust means rotatable with the serving guide for inducing a i'low of air around the serving guide to carry away any lint from the serving material, and means secured to the exhaust means for threading and guiding the serving material through the exhaust means onto the serving guide.

7. In an apparatus for applying a serving material to a core, a rotatable serving head carrying a bobbin of material to be served, a rotatable air impeller substantially enclosing the bobbin of serving material, a stationary housing enclosing the rotatable air impeller, and a ltering element mounted in the housing.

8. In an apparatus for applying a serving strand to a core, a. frame, a hollow rotary shaft through which the core passes, means for rotatably mounting the hollow shaft in the frame, a

bobbin mounted on the shaft, a rotary air impeller shell mounted on and adapted to rotate with the hollow shaft, and a stationary housing mounted on the frame and surrounding the bobbin and air impeller shell,'said housing comprising\two complementary semi-cylindrical members hinged together and maintained in closed position by a cooperating latching means.

9. In an apparatus for applying a serving material to a core, a frame, a hollow spindle through which the core passes, means for rotatably mounting the spindle to the frame, a bobbin of serving material mounted on the spindle, a serving guide secured to the spindle, an air impeller substantially enclosing the bobbin and secured to the rotatable spindle, said air impeller having an opening toward the serving guide, a housing surrounding the air impeller and secured to the frame and having an opening coinciding with the said opening in the rotatable air impeller, means in the housing for holding a removable ltering element, and means for rotating the spindle to operate the bobbin, the serving guide and air impeller to cause the material to be served on the core and set up air currents which pass around the serving guide through the said openings into the air impeller to the filtering elements to cause any lint from the serving material to impinge and be held thereon.

10. In an apparatus for applying a serving material from a bobbin thereof onto a core, a rotatable air impeller substantially enclosing the bobbin of material to be served and having an opening through which the bobbin is inserted, a stationary housing enclosing the rotatable air impeller and having an opening coinciding with the opening in the air impeller, and a serving guide projecting through the said openings for applying the serving material to the core.

11. In an apparatus for applying a serving material to a core to prevent lint or fibers from the serving material reaching the open air, a serving head, a serving guide, said guide having a gradually rounded portion over which the serving material passes in being applied to the core, said rounded portion reducing considerably the quantity of lint or fibers separated from the serving material, means for inducing a now of air inwardly along the core and over the serving guide to carry off any lint or fibers that might become separated from the serving material, and a lter for separating said lint or fibers from the ow of air.

12. In an apparatus for applying a serving material to a core, a rotatable serving head carrying a bobbin of material to be served on the core, a bobbin sleeve for carrying the bobbin of material, means resiliently engaging the bobbin sleeve for the purpose of maintaining a uniform tensionon the serving material and preventing the separation of bers from the serving material due to backlash action, a rotatable air impeller substantially enclosing the bobbin of serving material, a stationary housing enclosing the rotatable air impeller, and a filtering element mounted in the housing.

13.v In an apparatus for applying a serving material to a core,a rotatable serving head carrying a bobbin of material to be served on the core, adjustable means for applying a desired tension on the serving material for the purpose of minimizing the separation of bers from the serving material, a, rotatable air impeller substantially enclosing the bobbin of serving material, a stationary housing enclosing the rotatable air impeller.

and a nltering element mounted in the housing.

14. In an apparatus for applying a serving mayUNrr'iiD sum PATENTS terial to a core, a serving head, means for induc- Number Name Date a mg a. new of air inwardly along the core and A 986.690 Clark Mar. 14, 1911 around the serving head at the location where the 5 1,881,621 Janicki oet, 11, 1932 serving 1s applied to the core te carry directly into 1.978,086 Janssen oet, 23, 1934 the serving head any lint or fibers that might 2,074,391 Henning Mar, 23, 1937 become separated from the serving material, and 2,129,956 Pastor sept. 13, 193s a nlter for separating said lint or bers from the 2,390,454 Murphy Dec. 4', 1945 flow of air, said ilter being concentric with the 10 said air flow inducing means. FOREIGN PATENTS VINCENT A. RAY'BURN. Number Country Date 468,486 Great Britain July 6, 1937 REFERENCES CITED The following references are of record in the Il iile of this patent: 

